so the microarrays from the ducts or acini cells of all animals were pooled in an analysis designed to examine differences in gene expression between duct cells and acinar cells irrespective of disease state. Cluster analysis provided evidence of genomic distinction between ducts and acini in that ducts clustered separately from acinar but for a single outlier - See more at: http://www.jyi.org/issue/use-of-laser-capture-microdissection-and-cdna-microarrays-for-analysis-of-gene-expression-in-lacrimal-gland-secretory-cells-of-mrllpr-mice/#sthash.5nB06bJB.dpuf